如果您有50种不同的插头类型，那么电器将无法使用，而且会非常昂贵。
而且价格昂贵。但是，一旦插座标准化，许多公司就可以设计出不同类型的电器。
电器，竞争随之而来，为消费者创造了更多的选择和更优惠的价格。
-- 比尔-盖茨
Non-unique Elements
给您一个非空整数序列。 对于这个任务，您应该返回Array (Array)只包含初始序列中的非唯一元素。为此，您需要删除所有唯一元素（在给定序列中只包含一次的元素）。解决这个问题时，不要改变元素的顺序。例如：在[1, 2, 3, 1, 3] 中1, 3 是非唯一元素，结果将是[1, 3, 1, 3] 。
输入： 数组 (Array)的整数 (number)...
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Settings
CheckiO Extensions
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=js config --key=
Sync solutions into your local folder
checkio sync
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
Pair Programming (Beta-version)
Welcome to Pair Programming! Engage in real-time collaboration on coding projects by starting a session and sharing the provided unique URL with friends or colleagues. This feature is perfect for joint project development, debugging, or learning new skills together. Simply click 'Start Session' to begin your collaborative coding journey!
Waiting for Pair Programming to start...
You are trying to join a pair programming session that has not started yet.
Please wait for the session creator to join.
Waiting for Pair Programming to reconnect...
It looks like the creator of the pair programming session closed the editor window.
It might happen accidentally, so that you can wait for reconnection.
